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MPL 20x3x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020130

GTIN/EAN: 5906301811367

5.00

length

20 mm [±0,1 mm]

Width

3 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

0.9 g

Magnetization Direction

↑ axial

Load capacity

2.33 kg / 22.90 N

Magnetic Induction

370.68 mT / 3707 Gs

Coating

[NiCuNi] Nickel

0.394 with VAT / pcs + price for transport

0.320 ZŁ net + 23% VAT / pcs

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Technical details - MPL 20x3x2 / N38 - lamellar magnet

Specification / characteristics - MPL 20x3x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020130
GTIN/EAN 5906301811367
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 20 mm [±0,1 mm]
Width 3 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 0.9 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.33 kg / 22.90 N
Magnetic Induction ~ ? 370.68 mT / 3707 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x3x2 / N38 - lamellar magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Engineering modeling of the magnet - report

The following data are the outcome of a engineering simulation. Results were calculated on models for the class Nd2Fe14B. Real-world conditions may deviate from the simulation results. Use these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
MPL 20x3x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3700 Gs
370.0 mT
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
medium risk
1 mm 2103 Gs
210.3 mT
0.75 kg / 1.66 lbs
752.3 g / 7.4 N
safe
2 mm 1172 Gs
117.2 mT
0.23 kg / 0.52 lbs
233.7 g / 2.3 N
safe
3 mm 721 Gs
72.1 mT
0.09 kg / 0.20 lbs
88.5 g / 0.9 N
safe
5 mm 345 Gs
34.5 mT
0.02 kg / 0.04 lbs
20.3 g / 0.2 N
safe
10 mm 101 Gs
10.1 mT
0.00 kg / 0.00 lbs
1.7 g / 0.0 N
safe
15 mm 42 Gs
4.2 mT
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
safe
20 mm 21 Gs
2.1 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
safe
30 mm 7 Gs
0.7 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Sliding load (wall)
MPL 20x3x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.47 kg / 1.03 lbs
466.0 g / 4.6 N
1 mm Stal (~0.2) 0.15 kg / 0.33 lbs
150.0 g / 1.5 N
2 mm Stal (~0.2) 0.05 kg / 0.10 lbs
46.0 g / 0.5 N
3 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N
5 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 20x3x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.70 kg / 1.54 lbs
699.0 g / 6.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.47 kg / 1.03 lbs
466.0 g / 4.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 20x3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
1 mm
25%
0.58 kg / 1.28 lbs
582.5 g / 5.7 N
2 mm
50%
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
3 mm
75%
1.75 kg / 3.85 lbs
1747.5 g / 17.1 N
5 mm
100%
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
10 mm
100%
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
11 mm
100%
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
12 mm
100%
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N

Table 5: Working in heat (material behavior) - thermal limit
MPL 20x3x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
OK
40 °C -2.2% 2.28 kg / 5.02 lbs
2278.7 g / 22.4 N
OK
60 °C -4.4% 2.23 kg / 4.91 lbs
2227.5 g / 21.9 N
80 °C -6.6% 2.18 kg / 4.80 lbs
2176.2 g / 21.3 N
100 °C -28.8% 1.66 kg / 3.66 lbs
1659.0 g / 16.3 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 20x3x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.06 kg / 11.17 lbs
4 866 Gs
0.76 kg / 1.67 lbs
760 g / 7.5 N
N/A
1 mm 3.01 kg / 6.64 lbs
5 705 Gs
0.45 kg / 1.00 lbs
452 g / 4.4 N
2.71 kg / 5.97 lbs
~0 Gs
2 mm 1.64 kg / 3.61 lbs
4 205 Gs
0.25 kg / 0.54 lbs
245 g / 2.4 N
1.47 kg / 3.24 lbs
~0 Gs
3 mm 0.89 kg / 1.97 lbs
3 106 Gs
0.13 kg / 0.29 lbs
134 g / 1.3 N
0.80 kg / 1.77 lbs
~0 Gs
5 mm 0.31 kg / 0.67 lbs
1 816 Gs
0.05 kg / 0.10 lbs
46 g / 0.4 N
0.27 kg / 0.61 lbs
~0 Gs
10 mm 0.04 kg / 0.10 lbs
690 Gs
0.01 kg / 0.01 lbs
7 g / 0.1 N
0.04 kg / 0.09 lbs
~0 Gs
20 mm 0.00 kg / 0.01 lbs
202 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
24 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
14 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
9 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
6 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
5 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
3 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 20x3x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Timepiece 20 Gs (2.0 mT) 2.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Car key 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Dynamics (cracking risk) - collision effects
MPL 20x3x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 51.34 km/h
(14.26 m/s)
0.09 J
30 mm 88.88 km/h
(24.69 m/s)
0.27 J
50 mm 114.74 km/h
(31.87 m/s)
0.46 J
100 mm 162.27 km/h
(45.08 m/s)
0.91 J

Table 9: Anti-corrosion coating durability
MPL 20x3x2 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)

Table 10: Construction data (Flux)
MPL 20x3x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 748 Mx 17.5 µWb
Pc Coefficient 0.32 Low (Flat)

Table 11: Submerged application
MPL 20x3x2 / N38

Environment Effective steel pull Effect
Air (land) 2.33 kg Standard
Water (riverbed) 2.67 kg
(+0.34 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely reduces the holding force.

3. Power loss vs temp

*For standard magnets, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.32

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical and environmental data
Material specification
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Ecology and recycling (GPSR)
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020130-2026
Magnet Unit Converter
Pulling force

Magnetic Field

Check out also offers

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 20x3x2 mm and a weight of 0.9 g, guarantees premium class connection. As a block magnet with high power (approx. 2.33 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. Watch your fingers! Magnets with a force of 2.33 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 2.33 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 20x3x2 / N38, it is best to use strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 20x3x2 mm, which, at a weight of 0.9 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 20x3x2 mm and a self-weight of 0.9 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of neodymium magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even during nearly ten years – the drop in power is only ~1% (according to tests),
  • They show high resistance to demagnetization induced by external field influence,
  • By applying a decorative layer of nickel, the element has an professional look,
  • Magnets are distinguished by very high magnetic induction on the working surface,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to modularity in forming and the ability to adapt to unusual requirements,
  • Huge importance in modern industrial fields – they serve a role in magnetic memories, motor assemblies, medical devices, as well as technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Characteristics of disadvantages of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using casing - magnetic mount.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these devices can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum magnetic pulling forcewhat it depends on?

Information about lifting capacity was defined for the most favorable conditions, including:
  • with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an ground touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction vertical to the plane
  • in temp. approx. 20°C

Lifting capacity in practice – influencing factors

During everyday use, the actual lifting capacity results from several key aspects, ranked from the most important:
  • Distance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Material type – the best choice is pure iron steel. Stainless steels may attract less.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Warnings
Do not overheat magnets

Monitor thermal conditions. Exposing the magnet to high heat will destroy its properties and pulling force.

Pinching danger

Risk of injury: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

GPS and phone interference

A powerful magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to avoid breaking the sensors.

Magnets are brittle

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

No play value

Adult use only. Small elements pose a choking risk, causing severe trauma. Keep away from children and animals.

Respect the power

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Sensitization to coating

Studies show that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands or select coated magnets.

Pacemakers

For implant holders: Strong magnetic fields affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Combustion hazard

Powder produced during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Cards and drives

Avoid bringing magnets near a wallet, laptop, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Attention! Need more info? Read our article: Why are neodymium magnets dangerous?